William sidetey whyte



W. S. WHYTE.

VALVE FOR PNEUMATIC TOOLS.

APPLICATION FILED lULY19, 1919.

1,343,951. Patented June 22,1920;

p K H 9 "WEN TOR Z1), ,5, Zdhyte UNITED stares PATENT OFFICE.

WILLIAM $IDNEY WHY'JLE, 0F BEDFORD, INDIANA.

VALVE FOE PNEUIIIATIC TOOLS.

To all whom it may concern:

Be it known that 1, WILLIAM S. WHYTE, a citzen of the United States, anda resident of Bedford, in the county of Lawrence and State of Indiana,have made certain new and useful Improvements in Valves for PneumaticTools, of which the following is a specification. 1

My invention relates to valves and particularly to a valve adapted to beinserted in a hose or conduitto control the flow of compressed air orother motive fluid to a pneumatic drill or the like.

An object of my invention is the provision of a valve of the abovedescribed character which is constructed to provide a gradual admissionof compressed air to the drill to effect a variance in the power strokeof the drill, whereby the execution of tine and delicate work can bereadily performed.

Another object of my invention is the provision of a simple andefiicient means for attaching a valve hose or conduit to the driilcasing.

I will describe only one form of valve and hose attaching meansembodying my invention and will then point out the novel i eaturesthereof in claims.

In the accompanying drawings:

Figure 1 is a fragmentary view showing in side elevation, one form ofvalve and hose coupling embodying my invention.

Fig. 2 is a vertical sectional view of Fig. 1.

Fig.3 is a sectional view taken on line 33 of Fig. 1.

Similar reference characters refer to similar parts in each of theseveral views.

Referring specifically to the drawings, K designates the casing for apneumatic tool such as a hammer drill or the like to which compressedair is supplied from a hose H through acou'pling member designatedgenerally at C. The coupling member comprises a cylindrical body Bhaving a major part of its inner wall formed with screw threads S, asclearly shown in Fig. 2. This hollow portion of the body B is adapted toreceive a coupling piece A comprising a head portion 15, which isthreaded to engage the threads S, and a shank 16 which normally projectsbeyond the end of the body 13. The shank 16 is designed to be insertedinto the adjacent end of the flexible hose H and is threaded exteriorlyto se- Specification of Letters Patent. Patented J 11119 22 192()Application filed July 19, 1919.

Serial No. 311,964.

curely grip the wall of the hose for drawing the same within the body13. When secur ing the hose H to the coupling member C, the couplingpiece 11 is first removed from the body B and its shank 16 insertedwithin the hose H. The head portion is now introduced in the body B andby rotating the latter the coupling piece is fed inwardly until itoccupies the position shown in Fig. 2.

As shown in Fig. 2, the head portion 15 normally abuts a partition 17formed interiorly of the body B. 18 designates the end wall of the body13 which co-acts with the partition 17 to form a valve casing 20 for avalve designated generally at V.

Formed integral with the end wall 18 is a screw threaded annularextension 19 which is adapted to be inserted in the end of tie toolcasing K, as clearly shown in l ig. 2. l designates generally a passagein the coupling C for supplying compressed air to the tool casin K. Inthe present instance, the passage T is provided by forming the couplingpiece A, the partition 17, and the end wall 18 with alined openingswhich coincide with the axis of the extension 19. In this manner acontinuous passage is established with the hose H and the casing K.

[is shown in Figs. 2 and 3, the valve V comprises a circular bodyportion 21 which is mounted for a sliding movement within the casing 20.The lower end of the casing 20 is normally closed by a cap 22 which hasa screw threaded engagement with the partition 17 and the end wall 18,and acts as a support for a coiled retractile spring 23. The upper endof the spring 23 encircles a lug 24- formed of the lower end of the body21, and such spring normally biases the body 21 upwardly to the positionshown in Fig. 2. As shown to advantage in Fig. 3 the body 21 is formedadjacent its upper end with annular channels 25 and 26 spaced apart byan annular rib 27. These channels 25 and 26 act as ports for controllingthe passage oi compressed air from the hose H to the housing K, and whenthe body 21 occupies such a position that the channel 26 registers withthe passage P, a small quantity of air from the hose H is allowed totraverse the passage P and enter the casing K. This eiiect is secure byvirtue of the fact that the depth of the channel 26 is such that only asmall'quantity of air can pass therethrough, when such channel is inregistration with the passage P. Channel :27 is relatively deep so thatwhen removed into registration with the passage P, a greater quantity ofair is admitted to the casing K.

The channels 25 and 26 are moved into registration with the passage P bymeans of a handle D which is detachably connected to a stem D formed onthe upper end of the body 21 and working through the upper end wall ofthe casing 20; It will be understood that in order to move the valve Vto open position, the handle D is pushed downwardly so that the valvemoves against the tension of the spring 23. After the valve body 21 hasbeen moved downwardly a predetermined distance, the channel 26 registers with the passage P, and upon continued movement of the valve, bothchannels 25 and 26 now register with the passage P so that a full supplyof compressed air is admitted tovthe casing K. It will thus be seen thatwhen the valve is moved from closed po-' sition to full open position, agradual increasing supply of air through the passage P is effected. Sucha control obviously permits the operation of a pneumatic tool with powerstrokes of various intensities that variouscharacters of delicate workcan be efliciently executed. WVhen pressure upon the handle D isremoved, the spring 23 forces the valve to closed position, as wil beunderstood.

From the foregoing description, taken in conjunction with theaccompanying drawings, it will be manifest that I have provided a hosecoupling of simple and ellicient construction, at the same timeelin'iinating the use of wire clamps. It will be further noted that'theconstruction of the valve V is suchthat an eilicient regulation of theair supply is obtained to control the action of the pneumatic tool andthereby regulate the power of the tool.

Although, I have herein shown and described only one form of couplingand valve embodying my invention, it is to be understoodtha't variouschanges and modifications may be made herein, without departing from thespiritof the invention and the'spirit and scope of the appended claims.

Having described my invention, what I claim isi r 1. In -rombination, abody having a supply passage formed therein and a 'ulve slidable in thebody and controlling such passage, said valve comprising a body portionformed with a pair of annular channels.

2. In combination, a body and supply passage formed in the body, a valveslidable in the body and controlling said passage, nieans'for biasingsaid valve to closed position, manually operable means for moving saidvalve to open position against said biasing means, and annular channels'i'oruicd in said valve for ellecting a gradual control of said pa,sage.

3. In combination, a hose, :1 pncun'nitic tool casing, a coupling memberconnecting said hose and con'iprising a body portion, a coupling piecethreadedly mounted in thc body portion and having a portion thereofinserted with said hose, an extension torined on the body portion andthrendedly engaging said casing, a valve casing formed in the bodyportion, a '1 air supply passagc formed in said coupling piece a valvefor controlling said passage, and means or biasing said valve to closedposition.

4:. A pipe coupling comprisinga cylindrical body portion, a couplingpiece rdiustable loi'igitudi'milly within the body portion, a threadedshard: formed on the coupling piece and adapted to be inserted in thehose "for drawing the latter into the body when said piece is adjustedlongitudinally in one direction, a valve casing formed in the bodyportion and a valve slidable in said casing, and means for biasing saidvalve to one position. i

'5. A valve for a pneumatic tool comprising a cylindrical casing havingports formed therein, a circular -body portion slidable in the casing,and channels formed in said body portion for eliciting a gradual openingof said ports when the body portion is moved. across the ports.

6. In combination, a valve casing, a valve body slidable in the casing,superposed annular channels formed in the valve body, a handle formed onone end oi": the body. an extension formed on the opposite end of thebody, and a spring in the casing encircling said extension for biasingthe valve body to one end of the casing.

WILLIAM SIDNEY WH YTE.

